When comparing Treeswifts and "normal" or "true" Swifts, several key differences emerge:
* Perching Ability:
* Treeswifts possess a non-reversible hind toe, allowing them to perch on branches and twigs. This is a significant distinction, as true swifts are generally unable to perch in this manner.
* True swifts spend the vast majority of their lives in flight, rarely landing on anything other than vertical surfaces.
* Plumage:
* Treeswifts tend to have softer, glossier plumage, and often exhibit crests or other facial ornaments.
* True swifts generally have a more uniform, streamlined plumage.
* Tail Structure:
* Treeswifts have long, deeply forked tails.
* True swifts also have forked tails, but the depth of the fork can vary.
* Behavior:
* Treeswifts, while aerial insectivores, will often perch and then dart out to catch prey.
* True swifts are almost entirely aerial, catching insects on the wing.
* Nesting:
* Treeswifts build very small nests on the side of tree branches.
* True swifts often nest in cavities, such as holes in trees or buildings.
In essence, while both are aerial insectivores with long wings, Treeswifts have evolved characteristics that allow them to occupy a more "perching" lifestyle compared to the almost exclusively aerial existence of true Swifts.

Worldwide there are 4 species and 3of them in South-east Asai and we are happy to have 2 of them